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i have no clue about couter turtles, but there are some turtles that dont eat fish. fly river turtles are one that i know of, and my map turtle never touched any of my fish. but it might be like adding a betta in a community tank, hit or miss, but there are things you can do to improve your odds.

"While the species is highly herbivorous, river cooters will eat anything, plant or animal, dead or alive."
seems like this is an "at your own risk" situation. if you decide to do it keep your turtle full, lol

I personally know someone who had an FRT take a big chunk out of a xanthic Florida Gar.